Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa6f7adb5726956…

MALICIOUS

PDF

81.9 KB Created: 2021-04-02 13:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 685da9dc2bd5d1258334f3b544ce18da SHA-1: a6053f2c1581b070ab3544158bb837080ed8c4db SHA-256: 4fa6f7adb57269561f95b14bc4dfa509f982d5b6b54bbbd00bc1b917cb56c8ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to seemingly unrelated PDF documents, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/strik?utm_term=mossberg+930+shotgun+review
    • https://cdn-cms.f-static.net/uploads/4450870/normal_601fac0acdc44.pdf
    • https://static.s123-cdn-static.com/uploads/4474449/normal_5fceb3303afd0.pdf
    • https://pilidikuvitas.weebly.com/uploads/1/3/4/7/134766888/52c9928f007277.pdf
    • https://cdn-cms.f-static.net/uploads/4476432/normal_6035b772114ca.pdf
    • http://gidujoluj.mypressonline.com/ap_portfolio_concentration_examples.pdf
    • https://sopunarexij.weebly.com/uploads/1/3/1/8/131857112/lawumerepoluzij-siratuvet-dufuzejube.pdf
    • https://wisufomerimugil.weebly.com/uploads/1/3/4/0/134016782/videsatanofeb-duwidirinixoxub.pdf
    • https://static.s123-cdn-static.com/uploads/4481052/normal_5fecaec0cf8d8.pdf
    • https://bikanagika.weebly.com/uploads/1/3/4/4/134461715/d82d27fd.pdf
    • https://cdn-cms.f-static.net/uploads/4416672/normal_602ab0f51ea69.pdf
    • https://cdn-cms.f-static.net/uploads/4454808/normal_601ffc5806175.pdf
    • https://cdn-cms.f-static.net/uploads/4478378/normal_6052f26a07c3f.pdf
    • http://vexasefagi.scienceontheweb.net/d-link_dir-890l_ac3200_manual.pdf
    • https://static.s123-cdn-static.com/uploads/4407983/normal_5fdd430e23c62.pdf
    • https://vepifedufonun.weebly.com/uploads/1/3/1/4/131454255/390958.pdf
    • https://cdn-cms.f-static.net/uploads/4455185/normal_603524cd86f9b.pdf
    • http://mudixefibewab.mywebcommunity.org/3507029006.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/de4b3c2e-911b-4213-a409-b7c8bc275fcc/stihl_ms180_chain_adjuster.pdf
    • http://ruzofugeru.myartsonline.com/types_of_seismic_waves.pdf
    • https://uploads.strikinglycdn.com/files/2fa1ded6-47b6-4a3f-b48b-4b88e32a9599/zogifunakilanekamiba.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101e3.bin
e9e8e03f471782539981f43a945c301d11131e9e690c6904efed3bba10b15ce9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101E3 5464 bytes
font_01_sfnt_off00011495.bin
c668ce1564d4e134ada567f53da22e1a1962b5f00997d1415ba31bb69e222161		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11495 10528 bytes

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